Please kindly send me a business proposal write up and tips about teaching people on how to repair mobile phones

And you will send how many 100's of dollars?

Seriously, A business plan will have to include your skills, the location, what planing you have done in that location. What funds are available for operation and more.

A professional writer may get 100's of dollars for doing this.
And it can take days of research.

What are you trying to do ? Where ?
Are you trying to open a TECH SCHOOL to teach working on phones or a phone store ?

Really? You want someone here to write a business proposal for you?

Let me say, I need a business proposal for a restaurant I am working on so if you find someone here to write you one for free, let me know because I could use them too.

Send me a couple thousand $$$, I email you one right away.